Reboring tool



i H. NESS.

REBORING TO0L.* APPLICATI ONTILEDJUNE 23, 1921.

1,436,669. Patntd-Nv. 28,1922.

2 SHEETS--SH'EET 2.

Patented Nov. 28, 1922.

1,43e669 ICE..

HARoLDN'Ess, OF JERSEY CITY, NEW

* OF ONE-HALF TO LOUIS JERSEY, ASSIGNOR, BY MESNE F; NORTIER, OF NEWYORK, N. Y.

ASSIGN MEN TS,

REBORING rooL.

Application filed .Tune 23,

To aZZ whom z't may aoncem:

Be it known that I, HAROLD Nnss, a citizen of the United States, andresident of Jersey City, in the county of Hudson and State of NewJersey, have invented 'certain new and useful Improvements in ReboringTools, of which the following is a specification.

This invention relates to re-boring tools for cylinders, and myimprovenents are directed to apparatus of this character which iscapable of employment in re-boring the cylinders of engines, pumps,etc., without necessitating the demounting or taking down of thecylinders.

F urthermore my re-boring device is so constituted that its frame may berigdly mounted and secured upon a cylinder to be treated, and the boringor cutting tool adjusted with such precision that its operation will bein true concentric relation to the cylinder aXis. Stillfurther myimproved re-boring ap paratus includes a cutting member which isprovided with rolling end thrust means, guided by the interior surfaceof the cylinder, that holds the cutting edge of the tool positively toits work, ensuring the accuracy of the operation, and preventing thetool from skipping over abnormally hard Spots in the material of thecylinder.

Still further my invention comprehends the employment of automatic feedmeans,

` actuated by the cutter driving means, to

v upon a cylinder.

render the re-boring operation continuously rogressive. l Other featuresand advantages of my said invention will hereinafter appear.

In the drawings i Figure 1 sectional view of 1s a vertical,

tool, as mounted my improved re-boring Fg. 2 is a cross-sectional view,on the line 2-2 of F'g. 1.

F ig. 3 is a section on the line 3--3 of F g. 1.

Fig. 4 is Fi 1.

ig. 5 is a plan View of the cam bearng disk for the centering device,and

F ig. 6 is a plan view showing the variable speed gearing and the motorto operate the tool.

In carrying out my invention I employ a yoke like frame 1, having a baseflange portion 2. adapted to be seated upon the fiange a section on theline 4- 4 of 12, and

1921. Serial No. 479319,

3 of a cylinder 4 from which the head has been removed, said flange 2having bolt receiving slots whereby it may be securely bolted to theflanges 3 of different sized cylinders. h

The frame 1 has an upwardly extended annular enlargement 6, ofsubstantial 'proportions, 'and a vertical, hollow cylinder 7 is slidablewithin said enlargement, but being keyed thereto, to preventitsrotation.

Said cylinder 7 is of considerable length` to be capable of extendingbelow the frame 1 'for operation throughout the length of a cylinder. Ais shouldered at 10 to comprise an upper thrust bearing'against a plate11, that is apertured to permit the extension therethrough of saidshaft. Plate 11 is Secured to the upper end of cylinder 7 as by screwssaid plate has a lateral extension, 13, with an aperture 14, for thereception' of a drive rod 15, which `will be more particularly referredto hereinafter.

The shaft 9 is' provided with an annular groove 16 toward its lower end,'said groove serving for the reception of the inner portion of aring 17(which may be in two halves for convenience of 'assembly), and

shaft 9, revoluble'in cylinder 7 said ring being secured to the lowerend of cylinder 7 as by screws 18. The engagement-ofring 17 in groove 16constitutes an end or thrust bearing for shaft 9, (which is the cutterhearing member of the device) in both directions, and co-acts withhearing 10 in absorbing the reactive thrust of the tool.

The shaft 9, below groove 16, has a transverse aperture 19 to receivethe cutting or boring device. This device 'is 'in two parts, andconsists of a cutter bar 20, whose edge portion 21 extends out tooperate'upon the inner surface ofa cylinder, as 4, and an opposed bar22, whose outer end is provided` with lugs or bearings 23,' in which isjournalled a roller 24, with a central, annular enlargement 25, whosefunction is to bear against the cylinder surface, in opposed relation tothe cutter, in order that the edge of said cutter may be held, axiallyof the cutting device, continually in effective opi The two part cuttingdevice is Secured to the shaft 9 by means of a set screw 26, threadedthrough shaft 9, right angularly to the axis ofaperture 19, said screwhaving a terminal plate 27 that clamps against flattened portions f28respectively on the bars 20, 22. A hardened ring 29, is fitted snuglyand securely upon shaft 9, as by swaging, and has apertures 30, 30,aligned with' aperture 19, to extend the cross-sectional hearing areafor elements 20, 22, to stifl'en and mender the latter more rigid inoperation.

The lower terminal portion 31 of shaft 9', is of inverted frusto-conicalform, and is adapted to have fitted thereto a circular, plate-likemember 32, by means of a central, thimble-like portion '33 thereof, saidportion 31 having a bayonet slot 34, with which a pin 35 on thimble 33engages, to comprise looking means. Also said plate 32 is provided, witha depending, concentric flange 36,.that is pierced with radial slotsTool centering shoes 38, of which three are herein shown, each carriedby a bar 39 slidable in a slot 37, extend out beyond fiange 36, toco-act With the innersurface of the cylinder to be re-bored, to adjustthe tool in its centeredrelation therewith. For this purpose the shoebars 39 each-Carry a stud 40, said studs respectively engaging in 'camslots 41 provided in a circular plate 42 that is revolubly fitted withinfiange 36, whereby, upon rotation of plate 42, the bars 39 are caused tomove either in or out, in synchronism, according to the 'direction ofrotation of plate 42. Arentral, squared key-way 43 in plate 42 servesfor the reception of a key, to actuate said plate.

A cover plate 45 also tits within flange 36 to retain plate 42 in place,and is itself removably Secured as by a set screw 46. v

The shoe bars 39 may each be locked in their set positions of radial adjustment by means of screw studs 47, that project upwardly from the bars,through radial slots 48 in plate 32,' and are Secured with nuts 49 thatbind them to said plate 3.2.

The shaft 9 may be suitably rotated within cylinder 7 for the operationof the cutting device. In the present example I have shown a worm wheel50 carried by the upper end of said shaft, for engagement by -drvingmeans such as a motor 51.

As the shaft 9 rotates for the performance of the cutting operation, ittogether with the cylinder 7 is accorded a regulated feed movement bythe following instrumentalities.

The feed rod 15 is in telescopic relation wth a tube 52, beingkeyedthereto at 53, and said tube, which has slidably keyed -thereon a wormwheel 54, that is ,in meshed relation with a. vertical rack 55 oncylinder 7, is both revoluble and slidable in a` ,hearing apertureprovided therefor in enlargement 6 of the frame. v

The rack 55 itself serves as a spline that engages a slot 55 inenlargement 6 to key the cylinder against rotation in the frame.

The shaft 9 is provided with the gear wheels 56 and 57, which arerespectively of smaller and larger diameters, the. smaller diameter gear56 being in mesh with a relatively large gear 58 mounted on rod 15, andthe gear 57 being in mesh with a relatively small gear 59, also mountedon rod 15. spline 60, carried by rod 15 may, by shifting said rod, becaused to enter either a slot 61 in gear 58 or a slot 62 in'gear 59,according to whether the feed drive is to be slow or fast. Preferably,in making the first cut in a cylinder surface I employ the fast speedfor the feed and for the next cut I employ the slow s eed, especially asby this means the burnis ing efl'ect produced by the roller is morepronounced at the. slow speed.

The worm wheel 54 operates in a recess 63 therefor formed in enlargement6, said recess having an upper' thrust plate 64, secured to the materialof the enlargement by screw 65.

The tube 52 has terminal flange 66, to prevent its withdrawaldownwardly.

It will be noted that the hearing of shaft 9 within cylinder 7 isco-extensive with the shaft length, whereby the cutting device is heldclosely to its work. But to avoid excessive friction between thesemembers -an intermediate, annular clearance 68 is provided, which may becharged with lubricant, leaving-'only limited upper and lower portionsof the shaft in actual bearing relation with the cylinder.

The motor 51 may be carried by the shaft 9, to which it is here shownconnected, as by a bracket 69 that extends from a collar 70 which isrevolubly mounted upon said shaft 9. To revent rotation of the motorwith the revo uble movement of shaft 9, I provide means such as anextension 71 of the rigid member 11, said extension '71 being Secured asby a screw 72 to-the bracket 69.

Variations within the spirit and scope of my invention are equally'comprehended by the foregoing disclosure.

I claim:

1. A cylinder re`-boring tool comprising a hollow frame, means forsecuring said frame with relation to the cylinder to be re-bored,

with relation to the cylinder to be re-bored,

a tubular member non-rotatably mounted in said frame, and longtudinallyslidable theren, a shaft revoluble in said tubular member, the hearingsurfaces of the tubular member and shaft being nearly co-extensive,cutting means carried by. said shaft, and

means also carried by said shaft for co-act-' ing with the cylinder tocenter said cutting means relatively thereto.

3. In a cylinder re-boring tool in combination, a frame, a tubularmember slidable therein, oluble in said member and' carrying Variablespeed gears, a cutter earred by said a rack on said member, a shaftrevshaft, a worm mounted-in said frame and 15 meshed With said rack, atubular member splined to said worm, zt rod splned to said tubula'rmember, variable speed 'gears carried by said 'od respectively in meshwith the gears on said shaft, and selectve means 0 for translatng the'revoluble movement of said shaft into endwse movement for said tool,through said variable speed gears.

Signed' at the borough of Manhattan, in the city, County and State' ofNew York, 25 this 21st day of June-A D.-l921.

HAROLD NESS.

